Shaft seal



FIG. 1 is a perspective view from above illustrating the top and right side of a shaft seal;

FIG. 2 is an elevation view of the front of the shaft seal of FIG. 1;

FIG. 3 is an elevation view of the right side of the shaft seal of FIG. 1; and,

FIG. 4 is an elevation view of the left side of the shaft seal of FIG. 1.

Where applicable, portions of the shaft seal are shown in broken lines herein for illustrative purposes only, and form no part of the claim. 

CLAIM The ornamental design for a shaft seal, as shown and described. 